High-speed cross-winding device

ABSTRACT

High-speed cross-winding apparatus with two traverse motion devices for winding elongated materials, especially continuous filaments, such as tapes and threads into packages, particularly at filament velocities exceeding 1,500 m/min. and embodying a first traversing device in the form of a reciprocable thread guide, and a second traversing device in the form of a pair of rotatable thread guide means taking over the thread traverse stroke near the respective ends of the traverse stroke of said first device, means for driving said first and second traverse motion devices synchronously with each other, and independent means for rotatably driving the package. The second, stroke reversal device temporarily accelerates stroke velocity above the stroke velocity of the first device before and/or after stroke reversal, and the guide groove of the first device has a greater pitch before and/or after stroke reversal and an enlarged radius of stroke reversal curvature.

Unite States HIGH-SPEED CROSS-WINDING DEVICE [75] Inventors: HeinzSchippers; Erich Lenk, both of Remscheid, Germany [73] Assignee: BarmagBarmer Maschinenfabrik Aktiengesellschaft, Wuppertal, Germany 22 Filed:Aug. 9, 1971 21 Appl.No.: 170,009

[52] US. Cl 242/43, 242/432, 242/158.3 [51] Int. Cl B65h 54/30 [58]Field of Search 242/43, 43.2, 158.5, 158.3

[56] References Cited UNITED STATES PATENTS 3.089.657 5/1963 Chaussy242/43 FOREIGN PATENTS OR APPLICATIONS 552,207 3/1943 Great Britain242/43 Primary Examiner-Stanley N. Gilreath Attorney, Agent, orFirm--Johnston, Keil, Thompson,

[57] ABSTRACT High-speed cross-winding apparatus with two traversemotion devices for winding elongated materials, especially continuousfilaments, such as tapes and threads into packages, particularly atfilament velocities exceeding 1,500 m/min. and embodying a firsttraversing device in the form of a reciprocable thread guide, and asecond traversing device in the form of a pair of rotatable thread guidemeans taking over the thread traverse stroke near the respective ends ofthe traverse stroke of said first device, means for driving said firstand second traverse motion devices synchronously with each other, andindependent means for rotatably driving the package. The second, strokereversal device temporarily accelerates stroke velocity above the strokevelocity of the first device before and/or after stroke reversal, andthe guide groove of the first device has a greater pitch before and/orafter stroke reversal and an enlarged radius of stroke reversalcurvature.

3 Claims, 2 Drawing Figures Pmmenumsmq 3791.767

sum znr 2 I n'" if LEGEND INVENTORS HEINZ SCHIPPERS .ERICH LENK 0 AT TORN EYS HIGH-SPEED CROSS-WINDING DEVICE RELATED APPLICATION The inventionherein relates to improvements in winding apparatus with dual traversedevices vof the type disclosed in application Ser. No. 884,933, filedDec. 15, 1969, by Heinz Schippers, now abandoned. The disclosure thereofis incorporated herein by reference.

INTRODUCTION The winding device'of said application operates with I twotraverse devices. The first traverse device is constructed as areciprocated thread guide and handles the distribution of the thread onthe package in the middle range of the traverse stroke. The secondtraverse device is a rotating thread guide means, preferably a threadguide groove, which is located exclusively in the two end zones of thetraverse stroke. At these places it takes over the distribution of thethread onto the package. Both traverse devices run except in thevicinities of the stroke ends according to the same law of motion, butwith a certainconstant lead of the thread guide in order to take intoaccount the lag of the thread between the first and second traversedevice. Through this constant lead it is assured that the thread onentry and in exit from the second rotating traverse arrangement runsonward at a constant speed in the traverse direction and without changeof the lag or distribution angle.

During the running'of thethread in the second traverse arrangement inthe vicinitie s of the stroke ends,

the first traverse device, i.e., the thread guide, however, follows aprinciple of motion peculiar to it, the objective of which is to keep assmall as possible, through as small as possible changes of velocity, theinertia forces acting on the thread guide asit reverses direction.

These small changes in velocity were hitherto possible to realize onlywhen the stroke of the thread guide is considerably smaller than thestroke of the second traverse devices, the thread guide grooves. Withthis motion of the thread guide, it has been demonstrated that thethread, because of excessive deviation of its running direction from thethread guide groove direction, is occasionally torn out of the threadguide groove. This occurs especially when as provided according to apreferred embodiment of said application the guide groove hasimmediately after the reversal point an increased pitch angle. Therebythere exists the problemof disturbances of the thread distribution andof thickenings or hard zones in the winding. These can lead to unevenengagement of the friction drive roller against the package, damage tothe thread and to the slippage of the threads down end faces of thepackages.

THE INVENTION It is the objective of the present invention to remedythese difficulties. According to the invention this is accomplished byguiding the reciprocating first traverse device during the running ofthe thread in the thread guide groove of the second traverse devicethrough its stroke reversal places with a slight speed change and beforeand/or after its stroke reversal with a temporary, greater speed thanthat maintained in the middle range of the traverse stroke, the strokelength of the first traverse device being approximately equal to thestroke length between the thread guide grooves.

Briefly, the invention provides (1) a first traverse device having areciprocable thread guide for guiding the thread over the mid-range ofthe winding strokes, and (2) a second traverse drive having spacedgrooves for picking up and guiding the thread at the respective ends ofthe strokes, the stroke length of said first traverse device beingapproximately equal to the maximum distance between said grooves. Theapparatus has drive means for said thread guide for moving said threadguide, while said thread is in said grooves, through the stroke reversalzones at low deceleration and acceleration while imparting, beforeand/or after stroke reversal, a velocity to said thread guide which isgreater than the velocity thereof while it traverses said mid-range.Preferably, the drive means is a reversibly spirally grooved roller, thegroove of which at the stroke ends having before and/or after the strokereversal point a pitch angle greater than the pitch angle in saidmidrange and also a greater radius of curvature at said stroke ends,i.e., greater than would be the radius of curvature at the stroke endswith grooves pitched at the pitch angle of the mid-range.

The advantage of the invention lies in that it makes it possible to keepthe speed changes of the thread guide in the reversal places withinsuitable limits, but nevertheless, to adapt the thread guide stroke tothe stroke length between the thread guide grooves. Through thisadaptation of the movements of the thread guide to those of the threadguide grooves it becomes possible to construct the thread guide groovesin such a way as is required for the even distribution and, inparticular, for the exact reversal of the thread in the package edgeswithout danger that the thread guide grooves will lose the thread.

THE DRAWINGS In the following description, the invention is illustratedwith a preferred embodiment illustrated in FIGS. 1 and 2, wherein;

FIG. 1 is a plan view of the traverse devices, the drive roller, and thewinding package with the thread thereon; and

FIG. 2 is a graphic projection of the movement of the traverse devicesand the distribution of the thread onto the package, the ordinate beingthe stroke (H) and the abscissa being the development r'qb.

THE PREFERRED EMBODIMENT The first traverse device is a thread guide 1,which in FIG. 1 has the instantaneous direction of movement 1 and isdriven by the reverse thread roller 24. The second traverse device is aparallel cylinder 2 with the thread guide grooves 5 and 6 at the strokeends. The cylinder 2 has the direction of rotation 2. The thread 7coming from the delivery mechanism 8 through the fixed thread eye 9 isguided in the zone of the traverse stroke ends over the thread guide 1into the groove 5 and from this onto the winding package 3, which isdriven by drive roller 4 in the direction of rotation 3'.

In the process there occur the following angles:

The lag angle 18 is the angle formed by the thread portion betweenthread guide 1 and thread guide groove 5 or 6. The angle 19 is thatbetween thread 7 and thread guide groove 5 or 6. The distribution angle20 is that formed by the thread running onto the winding package.

The curves 11, 12, 13 of FIG. 2 represent the movement of the threadguide 1, of the thread guide grooves 5 and 6 and of the run-on point 7'of the thread 7 onto the package 3. In principle, all the movements,except in the zones of the stroke ends, follow the same laws of motionwith a phase displacement in time. The underlying requirement for theavoidance of irregularities in the windings with respect to hardness andthickness is the maintenance of the sharp cornered curve 13 for therun-on point 7 of the thread 7 onto the package 3 as exactly as possibleduring reversal of the thread at the edges 13.

In order to bring about this exact reversal of the thread, the aforesaidapplication provided that the thread guide grooves 5 and 6 do notreverse at point 13 but, in correspondence to the curve 12, had anoverstroke l2 and thereupon an increased pitch angle 12". The threadguide 1 cannot follow the principle of motion along curve 13 in the zoneof the stroke ends, since then there would occur inadmissibly highinertial forces resulting from the sudden decelerations oraccelerations. For this reason, the thread guide 1 in a typical threadguide drive reverses with only slight delay or acceleration incorrespondence to the curve 11. Through the overstroke 12' of the threadguide grooves 5 or 6 on the one hand, and through the gentle reversal 11of the thread guide 1 on the other hand, however, the angle 19 (FIG. 1)between the running thread 7 and the thread guide groove 5 becomes sogreat that the thread is easily pulled out of the groove.

In order to avoid this, the thread guide drive according to thisinvention follows, in an example of execution, the curve 11" which isdistinguished besides by small delay of accelerations at its strokereversal points, by a stroke length increase with respect to the curve11 and an increased velocity in the zone 14 after the reversal of thestroke for the re-attaining of the synchronous traverse movements of thetraverse devices 1 and 2 and of the thread in the middle stroke range17. It is likewise possible to maintain an increased velocityanalogously to 14 only in the zone before the reversal.

Another possible example uses for the thread guide drive a principle ofmovement according to curve 11". This is distinguished, besides by astill less rate of deceleration or acceleration at the stroke reversalplaces, by the increased velocities in the zones 15 and 16 before andafter stroke reversal.

In all cases, through the temporarily increased velocity of the threadguide, it becomes possible to adapt its stroke to the stroke of thesecond traverse device despite low acceleration or deceleration valuesin the reversal zone, in which system its stroke there can be greater orsmaller than the stroke of the thread guide grooves 5 or 6.

The temporarily increased velocities of the thread guide 1 are achieved,in the case of drive by the reverse thread roller 24, by the increasedpitch angles 21 and 22 of the reversal thread. This simultaneously makespossible an increase of the radius of curvature 23 to provide areduction of the velocity change at stroke reversal.

It is thought that the invention and its numerous attendant advantageswill be fully understood from the foregoing description, and it isobvious that numerous changes may be made in the form, construction andarrangement of the several parts without departing from the spirit orscope of the invention, or sacrificing any of its attendant advantages,the form herein disclosed being a preferred embodiment for the purposeof illustrating the invention.

The invention is hereby claimed as follows:

1. A high speed winding appratus comprising a first traverse devicehaving a reciprocable thread guide for guiding the thread over themid-range of the winding strokes, a second traverse device embodying aroller having groove means for guiding the thread at the respective endsof the strokes and providing stroke reversal zones to impart strokereversal to the thread guided therein, said stroke reversal zoneembodying groove portions of given pitch and an intermediary curvedgroove segment at the stroke reversal point, at least one of said grooveportions having an increased pitch, relative to said given pitchimmediately following said intermediary curved groove segment to providerespective overstrokes to the guided thread, the stroke length of saidfirst traverse device being approximately equal to the maximum distancesbetween said groove means, and drive means for said thread guide formoving said thread guide, while said thread is in said groove means,through the stroke reversal zones at low deceleration and accelerationwhile imparting, before and/or after stroke reversal, a velocity to saidthread guide which is greater than the velocity thereof while ittraverses said mid-range, said drive means being a reversibly spirallygrooved roller, the grooves of which at the stroke ends having beforeand/or after the stroke reversal point a pitch angle greater than thepitch angle in said midrange and also an enlarged radius of curvature atsaid stroke ends.

2. A high speed winding apparatus as claimed in claim 1, wherein thegrooves of said reversibly spirally grooved roller have a maximumdistance between their stroke reversal points which is smaller than themaximum distance between said groove means of said second traversedevice and the length of the package.

3. A high speed winding apparatus as claimed in claim 2, wherein thegrooves of said reversibly spirally grooved roller have only after itsstroke reversal point a pitch angle greater than the pitch angle in saidmidrange.

IUNTIED 'STA'iES PATENT-*oFFIcE I PatentiNoQ '3.,7'9'7',7-67 "batedMarch 19,1974

Inventor(s) I Heinz 'Schip-pers' and Erich Lenk It is certified thaterror appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

First page, ninth-line, insert;

-[30] Foreign Application Priority Data August 14, 1970 Germany P 20 40479.9

Signed and sealed this 13th day of August 1974.

(SEAL) Attest:

MCCOY M. GIBSON, JR.

C. MARSHALL DANN Attesting Officer Commissioner of Patents FORM PO-1 050(10-69) USCOMM-DC 60376-P59 us. GOVERNMENT PRINTING OFFICE I969o-aes-asm

1. A high speed winding appratus comprising a first traverse devicehaving a reciprocable thread guide for guiding the thread over themid-range of the winding strokes, a second traverse device embodying aroller having groove means for guiding the Thread at the respective endsof the strokes and providing stroke reversal zones to impart strokereversal to the thread guided therein, said stroke reversal zoneembodying groove portions of given pitch and an intermediary curvedgroove segment at the stroke reversal point, at least one of said grooveportions having an increased pitch, relative to said given pitchimmediately following said intermediary curved groove segment to providerespective overstrokes to the guided thread, the stroke length of saidfirst traverse device being approximately equal to the maximum distancesbetween said groove means, and drive means for said thread guide formoving said thread guide, while said thread is in said groove means,through the stroke reversal zones at low deceleration and accelerationwhile imparting, before and/or after stroke reversal, a velocity to saidthread guide which is greater than the velocity thereof while ittraverses said mid-range, said drive means being a reversibly spirallygrooved roller, the grooves of which at the stroke ends having beforeand/or after the stroke reversal point a pitch angle greater than thepitch angle in said mid-range and also an enlarged radius of curvatureat said stroke ends.
 2. A high speed winding apparatus as claimed inclaim 1, wherein the grooves of said reversibly spirally grooved rollerhave a maximum distance between their stroke reversal points which issmaller than the maximum distance between said groove means of saidsecond traverse device and the length of the package.
 3. A high speedwinding apparatus as claimed in claim 2, wherein the grooves of saidreversibly spirally grooved roller have only after its stroke reversalpoint a pitch angle greater than the pitch angle in said mid-range.